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java.io.IOException: Filesystem closed	at org.apache.hadoop.hdfs.DFSClient.checkOpen(DFSClient.java:707)	at org.apache.hadoop.hdfs.DFSInputStream.close(DFSInputStream.java:619)	at java.io.FilterInputStream.close(FilterInputStream.java:155)	at org.apache.hadoop.util.LineReader.close(LineReader.java:150)	at org.apache.hadoop.mapred.LineRecordReader.close(LineRecordReader.java:244)	at org.apache.spark.rdd.HadoopRDD$$anon$1.close(HadoopRDD.scala:211)	at org.apache.spark.util.NextIterator.closeIfNeeded(NextIterator.scala:63)	at org.apache.spark.rdd.HadoopRDD$$anon$1$$anonfun$1.apply$mcV$sp(HadoopRDD.scala:196)	at org.apache.spark.TaskContext$$anonfun$executeOnCompleteCallbacks$1.apply(TaskContext.scala:63)	at org.apache.spark.TaskContext$$anonfun$executeOnCompleteCallbacks$1.apply(TaskContext.scala:63)	at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)	at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:47)	at org.apache.spark.TaskContext.executeOnCompleteCallbacks(TaskContext.scala:63)	at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:204)	at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:99)	at org.apache.spark.scheduler.Task.run(Task.scala:51)	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:183)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)	at java.lang.Thread.run(Thread.java:662)